June 2014 Chemistry Regents #26-30

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26  Given the balanced equation representing a reaction:

4Al(s) + 3O2(g) ==> Al2O3(s)

As the aluminum loses 12 moles of electrons, the oxygen

(1) gains 4 moles of electrons

(2) gains 12 moles of electrons

(3) loses 4 moles of electrons

(4) loses .12 moles of electrons

2 link law of conservation of charge

electrons lost must equal electrons gained

27  Which compound is an electrolyte?

(I) CH3CHO    (3) CH3COOH

(2) CH3OCH3 (4) CH3CH2CH3

3 link acids bases and salts are electrolytes

CH3COOH is a weak acid

See Table K

28 Which statement describes one acid-base theory?

(1) An acid is an H+ acceptor, and a base is an H+ donor.

(2) An acid is an H+ donor,. and a base is an H+ acceptor.

(3) An acid is an H- acceptor, and a base is an H-donor.

(4) An acid is an H- donor, and a base is an H acceptor.

2 link Bronsted Lowry acid base definitions

 

29 Which compounds are classified as Arrhenius acids?

(1) HCl and NaOH

(2) HNO3 and NaCl

(3) NH3 and H2CO3

(4) HBr and H2SO4

4 link Arrhenius acids Start with Hydrogen

also see table K

30 Which statement describes the stability of the nuclei of potassium atoms?

(1) All potassium atoms have stable nuclei that spontaneously decay.

(2) All potassium atoms have unstable nuclei that do not spontaneously decay.

(3) Some potassium atoms have unstable nuclei that spontaneously decay.

(4) Some potassium atoms have unstable nuclei that do not spontaneously decay.

3 link all atoms have unstable isotopes that spontaneously decay based on the ratio of protons to neutrons

some atoms have stable nuclei that do not decay

 

Questions 1-5 Questions 6-10 Questions 11-15 Questions 16-20 Questions 21-25 Questions 26-30 Questions 31-35 Questions 36-40 Questions 41-45 Questions 46-50

Question 51-54 Questions 55-56 Questions 57-58 Questions 59-61 Questions 62-65 Questions 66-69 Questions 70-72 Questions 73-75  Questions 76-79  Questions 80-82  Questions 83-85

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